Try changing the food as everybody mentioned above. Some good brands I tried in the past are listed in the Town Hall Topics - food thread. Eagle Pack, Solid Gold, Fromm, Innova, and Canidae. These are a little pricey, but well worth it. My girl is on Canidae now, which is a holistic type of foods, but her coat is very shiny and silky to the touch. No dandruff and she gets a bath about once a month. I also tried a medicated shampoo called SeboRex once which worked fine, but this does not resolve the issues, it just solves the symptoms.....Look at her food first, more than likely it is this.